/*
 * The contents of this web application are subject to the Mozilla Public License Version 
 * 1.1 (the "License"); you may not use this web application except in compliance with 
 * the License. You may obtain a copy of the License at http://www.mozilla.org/MPL/.
 * 
 * Software distributed under the License is distributed on an "AS IS" basis, 
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 
 * for the specific language governing rights and limitations under the License.
 * 
 * The Original Code is owned by and the Initial Developer of the Original Code is 
 * Composite A/S (Danish business reg.no. 21744409). All Rights Reserved
 * 
 * Section 11 of the License is EXPRESSLY amended to include a provision stating 
 * that any dispute, including but not limited to disputes related to the enforcement 
 * of the License, to which Composite A/S as owner of the Original Code, as Initial 
 * Developer or in any other role, becomes a part to shall be governed by Danish law 
 * and be initiated before the Copenhagen City Court ("K�benhavns Byret")            
 */

using System;
using Composite.Data.Foundation.CodeGeneration;

namespace Composite.Data.Foundation
{
    /// <summary>    
    /// Wraps data object, so changes to the original object won't be applied until the object is saved. Used for wrapping cached data.
    /// </summary>
    /// <exclude />
    [System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)] 
	public static class DataWrappingFacade
    {
        /// <exclude />
	    public static T Wrap<T>(T value) where T: class, IData
        {
            if (value is IDataWrapper) return value;

            Type wrapperType = WrapperSingleton<T>.WrapperType;

            return (T)Activator.CreateInstance(wrapperType, new object[] { value });
        }


        /// <exclude />
        public static T UnWrap<T>(T value) where T: class, IData
        {
            while (value is IDataWrapper)
            {
                var wrappedItem = value as IDataWrapper;
                wrappedItem.CommitData();
                value = (T)wrappedItem.WrappedData;
            }
            return value;
        }

        private static class WrapperSingleton<T>
        {
            private static readonly Type _wrapperType;

            static WrapperSingleton()
            {
                _wrapperType = DataWrapperTypeManager.GetDataWrapperType(typeof(T));
            }

            public static Type WrapperType { get { return _wrapperType; } }
        }
	}
}
